JP5430160B2 - Joint for connecting pipes and tubes. - Google Patents

Description

  The present invention relates to a joint for connecting pipes and tubes.

  As shown in FIGS. 8 (a) and 8 (b), this type of connecting joint is inserted into one joint 11 with one end of a short pipe 13 sandwiching a ring 12, and tightened with a nut 14, and then the short pipe 13 The other end is inserted into the other joint 11 with the ring 12 interposed therebetween, and is tightened with a play nut 14 to form a pipe line.

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  The fact that many members are required for connection between joints in this way takes a lot of trouble in connecting the joints, and there are many members between the connected joints, resulting in the risk of airtightness and watertight leakage. There was a problem that the number of inspection points after connection was too large, making inspection difficult.

The present invention relates to a joint for connecting pipes and tubes, which is formed using a fluorine-based thermoplastic resin that can be expanded and reduced to its original shape without being weakened even when the diameter is reduced . A male pipe is provided on one side, and a female pipe having the inner diameter of the male pipe as an outer diameter is formed on the other side. The male pipe can be rotated by press-fitting while expanding the inner diameter of the female pipe and by pressing and contracting from the outside. In addition, an uneven mesh ring having a convex slope for preventing slippage is formed on the joint surface of the male and female pipes connected to a watertight ridge, thereby solving such a problem.

  According to the present invention, since the joints are directly connected by press-fitting, there is an effect that the connection can be efficiently made in a short time.

  Since members such as short pipes and ring play nuts are unnecessary, there is no effect of airtight leakage and water leakage, and the inspection can be facilitated.

  In addition, the joint of the present invention has a flow path between the male pipe and the female pipe in a straight shape, can be bent into an L shape, and can be formed in a cross shape by providing a branch portion in the middle, and is rotatable. The connection produces an effect that the pipe and the tube can be formed in a straight line, and a bent and various branch pipes can be efficiently formed.

The connection process of a joint is shown, (a) is before connection, (b) is a state in which the male tube is press-fitted while expanding the diameter of the female tube, and (c) is pressed from the outside of the female tube to reduce the diameter. (D) is a sectional view showing a connection completed state It is an enlarged view of a meshing ring part, (a) is an example in which the end surface of the convex annular ring is a vertical surface, (b) is an example in which the slope is the same. Partial enlarged view showing an example in which sealing rings fitted in the concave grooves are provided on both sides of the meshing ring. Sectional view showing connection example of pipeline (A) thru | or (c) is sectional drawing which shows a part of combination example of the connection part of a tube and a tube (A) thru | or (e) is sectional drawing which shows the example of pipe formation in a L shape and other joints Sectional drawing which shows one example of the branch which connected multiple joints It shows a conventional example, (a) is a cross-sectional view showing the state before connection of the other joint by member, (b) is a cross-sectional view after connection

  The present invention is a joint for connecting pipes and tubes, wherein a male pipe is provided on one side of the joint, a female pipe having an outer diameter of the male pipe as an inner diameter is formed on the other side, and the male pipe of the joint is connected to the male pipe. By press-fitting while expanding the inner diameter of the female tube, the two joints are rotatably connected, and the inner surface of the female tube is pressed against the outer surface of the male tube by the pressing and compressing diameter from the outer side of the female tube. It is a joint for connecting tubes and tubes in which one or several uneven engagement rings are provided on the joint surface of the male and female pipes to be engaged with each other.

  FIG. 1 shows an embodiment of the present invention, in which a plurality of joints 1 each having a square cubic shape are formed. Each joint 1 is provided with a male tube 2 on one surface and a female tube 3 having an outer diameter of the male tube 2 on the other surface. As shown in FIG. 1 (b), the female pipe 3 of the joint 1 adjacent to the male pipe 2 of the joint 1 is pressed into the female pipe 3 while the inner diameter of the female pipe 3 is expanded, and the joints 1 and 1 are rotatably connected. Let As shown in FIG. 1 (c), a gap K is generated between the outer shape of the male tube 2 and the inner diameter of the female tube 3 in the expanded portion of the female tube 3, but the female tube 3 is pressed and contracted from the outside. The gap K is eliminated, and the joint surface between the male and female tubes 2 and 3 is brought into contact with an air-tight and water-tight tube in a rotatable manner.

  Each joint 1 is formed of a polytetrafluoroethylene (tetrafluoroethylene) resin (PolyTetraFlouroEthylene, hereinafter referred to as PTFE) or a tetrafluoroethylene-perfluoroascoxyethylene copolymer (hereinafter referred to as PFA). PTFE or PFA is a fluorine-based thermoplastic resin that is chemically very stable due to the structure in which fluorine is surrounded around the carbon, and the fluorine having the highest electronegativity among all atoms is a bond that is firmly bonded to the carbon atom. There is no chemical separation due to the height of the force. Therefore, even if the inner diameter of the female tube 3 is enlarged and reduced, it does not become brittle and break in the process, It will be completely restored to its original shape by the pressing and shrinking diameter, and will be stabilized again in that state. It does not distort or open back.

  Furthermore, PTFE or PFA has the lowest friction coefficient among the synthetic resins because the surface energy of fluorine is very small, self-lubricating, and excellent wear resistance. In other words, the male tube 2 and the female tube 3 can rotate smoothly over a long period of time, and are excellent in heat resistance and chemical resistance, and are suitable for the distribution of gas and liquid in all situations as a conduit. Is.

Further, one or several meshing rings 4 and 5 are provided on the male tube 2 and the female tube 3 with the joint surface interposed therebetween to prevent the female tube 3 from being pulled out.
In addition to the vertical surface 4a as shown in FIG. 2 (a), the meshing rings 4 and 5 may be provided with a slope 4b in a direction that does not come out as shown in FIG. 2 (b). With the meshing rings 4 and 5 being engaged, the extraction is reliably prevented, and the pressure resistance is significantly higher than that of the conventional joint. The meshing rings 4 and 5 may be provided in two or three at intervals. Reference numeral 6 denotes a sealing ring fitted with a groove. The sealing ring 6 may be provided on either side of the meshing rings 4 and 5, or may be provided on both sides of the meshing rings 4 and 5 as shown in FIG.

  FIG. 4 and subsequent figures show connection examples of the pipe 7a and the tube 7b. FIG. 4 shows a male pipe (male screw type) 2a and a female pipe (female screw type) 3a that connect the joints 1 and 1 and are exposed on both sides. A pipe 9 is formed by tightening nuts 8a and 8b into which the ends of the pipe 7a or the tube 7b are screwed.

  As shown in FIGS. 5 (a), 5 (b), and 5 (c), the connecting portion for connecting the tube 7a and the tube 7b should be formed by combining various shapes such as male screw shapes 2a and 2b and female screw shapes 3a. There is also.

  6 (a) and 6 (b) show an example in which an L-shaped passage 1b is provided in the joint 1a to form L-shaped and S-shaped bent lines 9a and 9b, and FIG. 6 (c) shows the joint. An example in which a cross-cross passage 1d is provided in 1c to form a cross-branch pipe 9c, FIGS. 6D and 6E show pipes 9d branched by providing T-shaped passages 1f and 1g in the joint 1e. The example which formed 9e is shown.

  Note that pipes other than those shown in the figure can be formed by changing the passage in the joint 1. Further, the joint may be formed in a cylindrical shape, a spherical shape or the like to form a pipe line provided with a number of radial branch passages. The joint is formed in a large or small size in accordance with a large diameter of 1 mm to 50 mm or more of the inner diameter of the tubes 7a and 7b.

  FIG. 7 shows an example in which a plurality of joints 1 are connected and a pipe 7a or a tube 7b is connected to each joint and branched. As shown in the figure, one pipe 7a, In addition to connecting the tube 7b, a plurality of tubes and tubes may be connected in the cross-branch shape described above. Further, the connected joints 1 and 1 can be turned freely in a free direction.

The connecting joint of the present invention can be connected efficiently in a short time, there is no risk of airtight leakage and water leakage, easy inspection, and it is free to rotate and is used to form a variety of bent and various branched pipes. It can be widely used as a joint.
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1 is a joint 1a, 1c, 1e is a joint 1b is an L-shaped passage 1d is a cross-shaped passage 1f, 1g is a T-shaped passage 2 is a male tube 2a, 2b is a tube, and a tube connecting male tube 3 is a female Tube 3a is a tube, tube connecting female tube 4 is a convex mesh ring 4a is a vertical surface 4b is a slope 5 is a concave mesh ring 6 is a sealing ring 7a is a tube 7b is a tube 8a, 8b is a nut 9 is a conduit 9a to 9e is a pipe of various shapes K is a gap

Claims (1)

A joint for connecting pipes and tubes, which is made of a fluorine-based thermoplastic resin that can be expanded and reduced to its original shape without being weakened even when the diameter is reduced, and a male pipe on one side of the joint A female tube having an outer diameter as the inner diameter of the male tube is formed on the other surface, and the male tube is rotatable and watertight by a press-fitting while expanding the inner diameter of the female tube and a compressed diameter from the outside. A joint for connecting pipes and tubes, characterized in that a concave and convex meshing ring having a convex slope for preventing slippage is formed on the joint surface of the male and female pipes.

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